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Tool Talk Discussion Forum

Earth ground for furnace

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matthies

01-18-2008 19:55:17




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I had a different furnace repairman here to fix the furnace since the regular guy seems to be called every month to replace some parts. Well the new guy found some wrong parts installed causing the problem and suggested to get the furnace a earth ground lead and was wondering if an electrician needs to be called or if I'm capable of this, and what this actually involves. thanks chris




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matthies

01-20-2008 20:12:35




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 Re: Earth ground for furnace in reply to matthies, 01-18-2008 19:55:17  
The furnace is a XE80 Trane on propane. It has a 3/4 or 1 inch copper feed line from the tank to the furnace. And the repairman doesn't want this to become a ground, if there is a leak. chris thanks for all the replies



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tech4

01-20-2008 10:01:00




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 Re: Earth ground for furnace in reply to matthies, 01-18-2008 19:55:17  
Just a little more information. If you do add another ground rod - make sure it is all bonded to the home electrical ground. I am guessing that the reason the HVAC tech suggested grounding is that you are having a problem with your flame sensor. Most of the flame sensors are thermocouples that generate a small amount of electrical current with heat. This current is sensed to keep supplying fuel. Sometimes poor grounding lets induced current from stray voltage or ground current distort the small current from the flame sensor and shut down the furnace. Is this the type problem you have been having?????

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Brian G. NY

01-20-2008 09:10:48




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 Re: Earth ground for furnace in reply to matthies, 01-18-2008 19:55:17  
You didn't say whether you had hot water or hot air but I just looked at my furnace and because mine is hot water (copper pipe) my electrician (also the plumber) clamped a piece of #6 copper wire from the main ground at the entrance box to the water line where the two are fairly close together. I would guess this would be all the ground you would need on a copper piped hot water system. In the case of a hot air system and assuming the furnace is not located too far from your entrance panel it would seem that a ground wire from the furnace connected to the main panel ground wire should be more than sufficient. Here in NYS two ten foot "earth" ground rods are required for grounding at the entrance panel. Don't know if it would meet code
but it sure seems logical to me.

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caterpillar guy

01-20-2008 08:22:45




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 Re: Earth ground for furnace in reply to matthies, 01-18-2008 19:55:17  
All that is needed for this earth ground he is talking about is a ground rod and for that a #12 or larger wire would seem suitable size for the job the ground rod could be either the existing one or any reputable electric store not the box stores should be able to hook you up for the length of the rod. drive it in and connect it up.



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tech4

01-19-2008 06:50:04




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 Re: Earth ground for furnace in reply to matthies, 01-18-2008 19:55:17  
I am not a member of the NEC police so take my answer with that in mind. Most furnaces that I have seen are bonded to the common electrical ground through the 3rd ground wire in the power feed to the furnace. Also if it is gas the metal pipe does provide a ground but that is one to be careful of because in my own house the gas line on the other side of the meter was plastic and a lightning strike actually burned a hole in the gas line. Bottom line all metal (water and gas pipes, ductwork through out the house should be bonded to the common electrical ground. You can call an electrician if you are unsure how to check but let me warn you that a licensed electrician had wired my house and the local inspectors had approved. I had a lightning expert install lightning rods and bond everything with #4 or bigger copper wires after the lightning incident.

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matthies

01-19-2008 11:30:46




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 Re: Earth ground for furnace in reply to tech4, 01-19-2008 06:50:04  
thanks tech4



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